package com.ziqi.hututubackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ziqi.hututubackend.constant.UserConstant;
import com.ziqi.hututubackend.exception.BusinessException;
import com.ziqi.hututubackend.exception.ErrorCode;
import com.ziqi.hututubackend.model.VO.LoginUserVO;
import com.ziqi.hututubackend.model.VO.UserVO;
import com.ziqi.hututubackend.model.dto.user.UserQueryRequest;
import com.ziqi.hututubackend.model.entity.User;
import com.ziqi.hututubackend.model.enums.UserRoleEnum;
import com.ziqi.hututubackend.service.UserService;
import com.ziqi.hututubackend.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.management.Query;
import javax.servlet.http.HttpServletRequest;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.ziqi.hututubackend.constant.UserConstant.USER_LOGIN_STATE;

/**
* @author wang
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-01-05 16:18:46
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{

    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword){
         //   1.校验
        if(StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if(userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号过短~");
        }
        if(userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if(!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次密码输入不一致");
        }
        // 2。检查是否有重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        long count = this.baseMapper.selectCount(queryWrapper);
        if(count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账户已存在");
        }
        // 3. 密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 4. 插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("帅帅气气");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult = this.save(user);
        if(!saveResult) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，请联系管理员");
        }
        return user.getId();
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //   1.校验账号
        if(StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号或密码不能为空");
        }
        if(userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号输入错误");
        }
        if(userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户输入错误");
        }
        // 2. 用户输入的密码加密；因为数据库中的密码是加密的，所以对比时也需要加密后对比
        String encryptPassword = getEncryptPassword(userPassword);
        // 3. 数据库查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        if(user == null) {
            log.info("user login failed,userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误~");
        }
        // 4.记录用户登录态
        request.getSession().setAttribute(USER_LOGIN_STATE, user);
        return this.getLoginUserVO(user);

    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        //判断是否登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);  //从session中获取当前登录用户
        User currentUser = (User) userObj;  //强制转为User类型
        //是否存在，不存在即未登录，返回异常
        if(currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        //从数据库查询（追求性能的话可以注释，直接返回上述结果）||避免缓存未修改情况下返回错误结果
        long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if(currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    @Override
    public Boolean userLogout(HttpServletRequest request) {
        // 判断是否登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        if(userObj == null) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
        }
        //移出登录状态
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    @Override
    public String getEncryptPassword(String userPassword) {
        // 盐值，混淆密码
        final String SALT = "qiguai";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }


    @Override
    public LoginUserVO getLoginUserVO(User user){
        if(user == null) return null;
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtil.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    @Override
    public UserVO getUserVO(User user) {
        if(user == null) return null;
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user, userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        //如果列表为空返回空数组
        if(CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
//        先转为流式，使用map对流中的每个对应user转为VO脱敏对象，最后将结果收集到一起返回
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }


    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        // 为空则抛出异常
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        // 获取查询信息
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
//        在数据库中查询用户信息，将查询到的信息返回
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }

    @Override
    public boolean isAdmin(User user) {
        if(user == null) return false;
        return UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }


}




